Ring the bell is a common action in aerobic exercise. It is often used in the training of losing weight and fat. When training, stand with your legs apart, hold the kettle bell with both hands, straighten your arms and bend your knees slightly. Training depends on the strength of the calf and upper body. Aerobic exercise refers to the physical exercise carried out by the human body under the condition of adequate oxygen supply. That is, in the process of exercise, the oxygen inhaled by the human body is equal to the demand, achieving physiological balance. Simply put, aerobic exercise refers to low-intensity, rhythmic exercise, which lasts for a long time (about 30 minutes or more) and has moderate or upper-middle intensity (60% to 80% of the maximum heart rate).